Pre-pasted wallpaper -- does the adhesive deteriorate in storage?

We have some pre-pasted wallpaper we bought about 5 years ago and never
used. Now, in a new house, we're trying to use it, but it doesn't want
to stick -- not just at the edges, but anywhere. Yes, I have followed
the instructions: immerse in water -- reverse rolled -- for no more than
15 seconds, then leave for 5 minutes with the wet pasted surfaces in
contact.
The layer of paste seems very thin -- almost non-existent -- and the
paper doesn't slide around easily for careful positioning like some
other pre-pasted paper I used recently.
Or is this just crappy wallpaper?
Perce

I did the same, and the results were not great. It is still up, but it
was cheap stuff that I kept for several years before tackling
the chore. Seams want to loosen just a tiny bit. I bought the same
paper, different color, and put it up right away. Borth
are in bathrooms. The one I papered right away is fine.
An old pro told me to use half-strength paste to put up pre-pasted
paper. The paper I used includes those
instructions now. Wallpaper is like paint - no point in using cheap
versions of either, as it is too
much work to do over again. I plan on this paper lasting for my
lifetime (I'm old :o)

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